Study On Static Performance Of Curved Continuous Beam Bridge

Curved continuous beam bridges are used in high-grade roads and urban roads because of their beautiful line shape and flexible layout of bridges.However,due to the linear shape of the upper structure,the stress is relatively more complicated.Previous studies and analysis of curved bridges focused on the coupling effect of bending and torsion and the shear lag effect of box girder.This paper takes the Maodong River Bridge as the engineering background.The analysis of the force performance of the curved continuous beam bridge.1)Review the domestic and foreign papers related to the curved beam bridge and shear deformation effect,and summarize the development of the research theory of curved beam bridge;based on the basic differential equation,analyze the mechanical characteristics of the bending and torsion coupling of the curved beam bridge.(2)Based on the derivation calculation of shear unevenness coefficient,the shear deformation effect will be incorporated into the finite element program BDCMS,and the representative section shear unevenness coefficient will be calculated,and then the shear deformation influence coefficient of the corresponding cantilever beam will be calculated;The box girder section is studied,and the variation law of the shear deformation influence with the high span ratio is studied,and the high span ratio threshold of the corresponding cantilever beam is obtained.(3)Considering the influence of shear deformation effect on the static performance of curved continuous beam bridge,based on the selection of classical beam theory beam element and Timoshenko beam theory beam element of Midas Civil,the calculation analysis model of straight and curved continuous beam is established respectively.The effect of shear deformation on the internal force and displacement distribution of the superstructure under the influence of self-weight,prestress and vehicle load,and the influence on the cumulative deflection of the cantilever construction stage.(4)Establish a spatial solid element model of the curved continuous beam bridge for lateral effect analysis.Select the critical section of the 1/4 cantilever condition,the maximum cantilever condition,and the bridged condition to analyze the lateral distribution of the normal stress and the lateral distribution of the transverse stress.The maximum distribution of lateral displacement of each beam segment is compared with the calculated value of the Civil beam element,which proves the necessity of lateral effect analysis of the curved continuous beam bridge.